Validates if a value has a length within a specified range or an exact length.

Parameters

• field_name: The name of the field being validated (atom).
• value: The value whose length is being checked (string).
• opts: Keyword list for validation options. Can be one of:
  • min and max for range validation.
  • length for exact length validation.

Return values

• :ok if the length of value is within the specified range or matches the exact length.
• {:error, field_name, "is too short"} if the length is less than min or length.
• {:error, field_name, "is too long"} if the length is greater than max or length.

Examples

iex> DValidate.ValidateLength.call(:field_name, "abc", min: 1, max: 3)
:ok

iex> DValidate.ValidateLength.call(:field_name, "a", min: 2, max: 5)
{:error, :field_name, "is too short"}

iex> DValidate.ValidateLength.call(:field_name, "abcdef", min: 1, max: 5)
{:error, :field_name, "is too long"}

iex> DValidate.ValidateLength.call(:field_name, "abc", length: 3)
:ok

iex> DValidate.ValidateLength.call(:field_name, "a", length: 5)
{:error, :field_name, "is too short"}

iex> DValidate.ValidateLength.call(:field_name, "abcdef", length: 5)
{:error, :field_name, "is too long"}